Table 4 Spline regression analysis, Duodenal perforated ulcers
Males | Females | |||
|---|---|---|---|---|
Year | Coef. | 95% Conf. interval | Coef. | 95% Conf. interval |
1975 | -0.17 | -0.44 0.09 | -0.21 | -0.58 0.16 |
1980 | 0.01 | -0.04 0.05 | -0.00 | -0.06 0.06 |
1985 | 0.02 | -0.02 0.06 | 0.10 | 0.04 0.16 |
1990 | 0.03 | -0.004 0.07 | 0.05 | -0.01 0.10 |
1995 | -0.05 | -0.09 -0.01 | -0.04 | -0.09 0.01 |
2000 | -0.11 | -0.14 -0.08 | -0.09 | 0.13 0.05 |